Process for rendering durable extracts of drugs



m1. Mar. 11, 1924.

'BUDOLF TAMBACH, OF LUDWIGSEAFEN-ON-THE-RHINE, G 1.: a

reno nu MESNE ASSIGNMEIQTS, TO THE CHEMICAL FOUNDATION, 1100., A COEJPORA'IIUH @11 DWABE.

PROCESS FOR BENDEBING DU .z.

' in Drawing.

To all whom it may concern:

' Be it known that I, Dr. RUDOLF TAMBACH, chemist, a subject of the German Emperor, residing at Ludwigshafen on the Rhine,

6 German Empire, have invented new and useful Improvements in Processes for Bendering Durable Extracts of Drugs; and I.

do hereby declare the following to be a full, clear, and exact description of the same.

In drugs of medicinal importance the effective constituents are generally combined with other constituents upon which de end more or less the stability of the ga enic preparations. it Inthe case of digitalis leaves the glycosides acting on the heart are combined with tannic acid compounds (see Gottlieb and Tambach, Munch. med. Wochenschrift 1911,

page 11, column 1, paragraph 6). '20 compounds, which have been isolated from the leaves by Gottlieb and Tambach, and are called digitannoids, are very easily dis-' solved in dilute alkalies. The solutions are particularly suitable for administration by means of injection, but become musty when allowed to remain in contact with the air.

They must therefore be preserved in ampullee, and be sterilized. The price of the preparations, consequently, is considerably ac increased.

It is well known that by adding glycerin to such solutions small. organisms are prevented from developing, and it is also known that camphor prevents putrefication and ex- 35 ercises a preserving. action (see Eulenburg,

'ReaLEnzyklopadie der ges. Heilkunde 1909,

volume 7, page 522, paragraph Further,

the addition of camphor for the ur ose of preserving tannin and gallic aci is own l 4 (see Chem. Zentralblatt 1900, ll, page 1107,

2. paragraph from thebottom).

Full or refined extracts of digitalis leaves, by the addition of lycerin or of such small quantities of campl ior, as, according to its 46 solubility, can be dissolved in aqueous alkaline solutions, are not protected against inoculation by must organisms or the like'in such a'manner that they can be used without danger for injections. 50 Now it has been foundthat it is solutions of digitalis leaves, or of digitalis extracts, if glycerin and camphor, or cam- These ossible. to preserve solutions of drugs, particularly Application filed lanuary 25, 1917. flerlal Noilfilfi.

phor surrogates, are added thereto or of such com osition that the extracted substances w not be thrown out of the solution, solutions of these substances. By camphor surrogates such agents are to be understood whih, like synthetic camphor, are able to exercise the functions of cam hor in preservin solutions of drugs, an when camphor is mentioned in the claims all such surrogates are likewise included. In solutions to which glycerin and camphor have been added the development of bacteria and other organisms is prevented, so that such solutions may remain in contact with the air without. becoming unsuitable for injections;

The glycerin is not used for the. purpose of obtaining more concentrated solutions, as in the case of a large number of organic substances. ][n the presence of glycerin aqueous solutions of camphor are not more concentrated than without glycerin.

Example I.

Example H.

100 gr. of the refined dry extract obtained according to the process set forth in' the German Patent 227572 or 245193 are dissolved with 400 com. of 2% soda solution and 1 liter boiled water, then 500- gr. of glycerin and 50 gr. of camphor are added, and the whole is diluted with-boiled water until a total volume of 14 liters is obtained. When cold the solution is filtered.

Ewample III.

'100 gr. of the digitannoid compound obtained according to the rocess set forth in the German Patent 2465 1 are dissolved in 1 liter of boiled water, the whole is diluted with boiled water until a total volume of 14 liters is obtained and heated with 500* gr.

glycerin and 50 gr. camphor at a temperature of about 70 C. When 'cold the solution is filtered.

Otherdrug solutions, which readily become must such as opium, secale cornutum etc., may e treated in a similar manner.

By addin glycerin and camphor to these solutions t ey are prevented from becoming must Y Wll at I claim and desire to secure by Letters Patent of the United States is 1. The process for preparing stable drug extracts which comprises addlng glycerine and camphor to such extract and then heating.

2. The process for preparing stable drug extracts which comprlses adding glycerine and camphor to such extract, heating and then separating the insoluble from the soluble portions.

3. The process for preparing a stable digitalis extract which comprises adding glycerine and camphor to a refined digitalis extract, heating and then separating the insoluble from the soluble portions.

4. The rocess for preparing a digitalis extract w ich comprises preparing an 1nfusion of digitalis, adding thereto glycerine and camphor, heating and filtering.

5. The process for preparing a digitalis 6. The process for preparing a digitalis extract which comprises preparing an in-. fusion from 1 kilogram of digitalis leaves in the roportion 1 to 10, adding thereto about 4 ilograms of glycerine and 20 grams of camphor, heating and filtering.

7. A new composition which consists of an extract of digitalis to which has been added from about 35 to 40 per cent-based on the amount of digitalis extract-of glycerine and about one per centbased on the amount of glycerine addedof camphor.

8. A new composition of matter consisting of an extract of digitalis 1 part, together with glycerine .4: part and camphor .002

part.

In testimony whereof I have'signed my name to this specification.

DR. RUDOLF TAMBACH. 

